| 摘要 |
An A/D converter that supports multi-mode and that can minimize power consumption is provided. A hybrid A/D converter 100 comprises: hybrid stages 101 to 103 composed of 1.5-bit A/D converter 111, 121 and 131 for pipeline use that convert analogue input signals into digital signals; 1/1.5-bit D/A converters 112, 122 and 132 that switch between pipeline use and delta-sigma modulation use according to the mode in use; analogue adders 113, 123 and 133 that subtract output of the 1/1.5 D/A converters 112, 122 and 132 from the analogue input signals; and analogue operation circuits 114, 124 and 134 that receive as input the output of the analogue adders 113, 123 and 133 and function as amplifiers in pipeline mode and as integrators in delta-sigma mode.
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